[Snyk] Security upgrade maven from 3.6.3-jdk-8-slim to 3.8.1-jdk-8-slim

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile

We recommend upgrading to maven:3.8.1-jdk-8-slim, as this image has only 89 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN10-LIBGCRYPT20-1582894	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN10-LZ4-1277601	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN10-OPENSSL-1569406	No Known Exploit

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